ALLDATA says I should have about 500lbs of weight in it, I agree it probably isn't necessary but thought I'd do it "right". Thought of weight plates which would be ideal but all I have around here are dumbells and I need just about my whole rack to make that kind of weight which is a PITA. I'll think about that though, maybe I will use a couple of the heavier ones so I don't need as much sand. Thanks.